<!DOCTYPE html>
<html lang="en">

<head>
    <style>
        html {
            height: 100%;
        }
        
        body {
            margin: 0;
            height: 100%;
            background: black;
            background: radial-gradient(#383838, #070707);
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        main {
            width: 800px;
            height: 500px;
            border: 20px solid #333333;
            border-radius: 10px;
            border-top: 40px solid #333333;
            border-bottom: 15 solid #333333;
            box-shadow: 0 0 19px white;
            background-image: url(aaa.png);
            background-size: 100% 100%;
            display: flex;
            
        }
        div{flex-grow: 1;
        }
        div:active{
            background: linear-gradient(rgba(255,255,255,0),rgba(255, 255, 255, 0),rgba(10, 10, 10, 0.5));}
    </style>
    <meta charset="UTF-8">
    <title>钢琴</title>
</head>

<body>
    <main>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>

    </main>
</body>

</html>